I would like to see Inventor accept material libraries directly from external sources like MatWeb. Their website indicates they exports for Autodesk Simulation products but not Inventor. There are a whole lot more Inventor users out there. A direct export would save the potential of hand-typing in each new material that a user wants to add to their custom library. See clip from their website below:
Solidworks users converting to Inventor look for this feature if they have used it in the past. Many thanks for your consideration!